CN109707690B - Electric proportional load sensitive multi-way valve integrated with hydraulic lock - Google Patents
Electric proportional load sensitive multi-way valve integrated with hydraulic lock Download PDFInfo
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- 239000003921 oil Substances 0.000 claims description 199
- 239000007788 liquid Substances 0.000 claims description 8
- 239000010720 hydraulic oil Substances 0.000 claims description 7
- 230000008878 coupling Effects 0.000 claims description 6
- 238000010168 coupling process Methods 0.000 claims description 6
- 238000005859 coupling reaction Methods 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 6
- 230000007246 mechanism Effects 0.000 abstract description 12
- 230000009471 action Effects 0.000 abstract description 11
- 238000000034 method Methods 0.000 abstract description 6
- 230000008569 process Effects 0.000 abstract description 6
- 150000001875 compounds Chemical class 0.000 abstract 1
- 239000002131 composite material Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000012356 Product development Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
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- 238000010276 construction Methods 0.000 description 1
- 238000004377 microelectronic Methods 0.000 description 1
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Abstract
The invention discloses an electric proportional load sensitive multi-way valve integrated with a hydraulic lock, which comprises a working coupler, a hydraulic coupler and a hydraulic control unit, wherein the working coupler is connected with the hydraulic coupler; the working connection comprises a valve body, a main valve core, a pressure compensation valve core, two hydraulic locks and two piston rods; the two hydraulic locks are respectively opened by the pressure of the two piston rods correspondingly; the valve body is provided with a working oil A port and a working oil B port, the working oil A port is communicated with the ninth oil duct through the opened first hydraulic lock, and the working oil B port is communicated with the fourth oil duct through the opened second hydraulic lock; the main valve core has three position states of a middle position, a first position and a second position. The invention reduces the leakage risk in the working process, improves the working reliability of the multi-way valve, and simultaneously reduces the matching requirement of the main valve core and the main valve hole. The pressure compensation function realizes that each actuating mechanism distributes flow according to needs, realizes the compound action of each actuating action of the land leveler, ensures that the land leveler realizes automatic control, improves the control precision of a hydraulic system and simplifies the oil circuit of the hydraulic system.
Description
Technical Field
The invention relates to the technical field of engineering machinery hydraulic pressure, in particular to the field of an electric proportional load sensitive multi-way valve for a land leveler.
Background
A land leveler is a main machine used for shaping and leveling work in earthwork, a hydraulic system of an actuating mechanism of the land leveler is mainly in the form of a gear pump and a manual switch valve at present and also in the form of a plunger pump and a manual load sensitive multi-way valve, the gear pump and the manual reversing valve are mainly used, each actuating mechanism is controlled through an operating handle, the flow of a working device of the land leveler is determined by the flow of the pump, when the flow demand is small, the land leveler is still output at enough flow, and certain power loss is generated. With the development of technology, high technology represented by modern microelectronic technology is becoming more and more common to modify the traditional structure of engineering machinery products, and a hydraulic system in the form of a plunger pump and an electric proportional load sensitive multi-way valve is a future development trend.
An external hydraulic lock is often configured in a hydraulic system pipeline of the existing land scraper product, or a hydraulic lock is integrated in the existing throttling type multi-way valve to lock hydraulic oil in an actuating mechanism, so that the hydraulic oil exists in an oil cylinder, and the safety performance and the service performance of the product are ensured.
The load-sensitive multi-way valve is widely applied to various engineering machinery at present, the composite action of a plurality of executing mechanisms can be realized in the working process of the valve, and when the flow of a pump is saturated, the action of each executing mechanism is not influenced by the load and is proportional to the opening degree of a valve core of a main valve, so that the flow required by different loads is effectively adjusted, and the action stability of the whole machine is ensured. The load sensitive multi-way valve is structurally provided with a pressure compensation valve in each connection, the pressure compensation valve is positioned behind the main valve core, the multi-execution mechanisms of the multi-way valve can act simultaneously, the highest load pressure of each execution mechanism is transmitted to a load feedback channel as a pressure signal through the shuttle valve, the pressure compensation valve is used for compensating the pressure of a working connection with lower load, the front and back pressure difference of the main valve core is kept consistent, and the anti-saturation function is realized.
At present, when the flow demand is small, the manual throttling type multi-way valve used by the existing land scraper in China still outputs enough flow to generate certain power loss, and meanwhile, a large amount of hydraulic oil circulates in a pipeline to reduce the service life. In addition, the grader is operated to control the machine through operating a plurality of handles continuously according to actual working conditions, the experience requirement on operators is high, the labor intensity is high, the precision of the grader cannot be further improved, and the construction efficiency is low. The load sensitive hydraulic technology can perform self-adaptive adjustment on working characteristics according to feedback of load pressure or flow signal change, but the existing load sensitive multi-way valve is directly selected, a plurality of external hydraulic locks need to be installed in a hydraulic pipeline, leakage points are multiple, pipeline arrangement is complex, and cost is high.
Disclosure of Invention
The purpose of the invention is as follows:
the invention designs an electric proportional load sensitive multi-way valve integrated with a hydraulic lock, which is specially used in a hydraulic system of a land scraper product, the hydraulic lock and an electromagnetic valve are integrated and designed on the basis of the original load sensitive multi-way valve controlled by a hydraulic pilot, the number of external hydraulic locks is reduced through the integrated design of the hydraulic lock, the system safety is improved, the oil return speed of an execution oil cylinder of the land scraper is controlled through the design of an internal spring of the hydraulic lock, the composite action and the automatic control of each execution action of the whole machine are realized, the operation control precision of the land scraper is improved, the operation intensity of an operator is lightened, the oil circuit of the hydraulic system is simplified, and the product development cost is saved.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
an electric proportional load sensitive multi-way valve integrated with a hydraulic lock is characterized by comprising a working link; the working connection comprises a valve body, a main valve core arranged in the valve body, a pressure compensation valve core positioned on one side of the main valve core, and two hydraulic locks and two piston rods positioned on the other side of the main valve core;
the two hydraulic locks are respectively opened by the pressure of the two piston rods correspondingly; the first piston rod and the second piston rod are respectively arranged on the third oil duct, and the first piston rod and the second piston rod are driven by the liquid pressure in the oil duct to respectively and correspondingly transmit pressure to the first hydraulic lock and the second hydraulic lock;
the valve body is provided with a working oil A port and a working oil B port, the working oil A port is communicated with the ninth oil duct through the opened first hydraulic lock, and the working oil B port is communicated with the fourth oil duct through the opened second hydraulic lock;
the main valve core has three position states of a middle position, a first position and a second position;
wherein,
when the main valve core is at the first position, a first oil duct leading to the pressure compensation valve core and a ninth oil duct leading to the second hydraulic lock are opened; the pressure compensation valve core is opened by the liquid pressure in the first oil duct, and when the pressure compensation valve core is opened, the first oil duct is communicated with the third oil duct; meanwhile, the fourth oil duct is communicated with a fifth oil duct for returning oil;
when the main valve core is at the second position, a first oil channel leading to the pressure compensation valve core and a fourth oil channel leading to the first hydraulic lock are opened; the pressure compensation valve core is opened by the liquid pressure in the first oil duct, and when the pressure compensation valve core is opened, the first oil duct is communicated with the third oil duct; meanwhile, the ninth oil duct is communicated with an eighth oil duct for returning oil;
when the main valve core is in the middle position, the supplied liquid does not enter the working connection, and the two hydraulic locks are blocked.
The main valve core is provided with a plurality of throttling grooves, and the corresponding positions of the throttling grooves correspondingly open and communicate the oil ducts.
The two ends of the main valve core are respectively sealed by an end cover controlled by a solenoid valve.
When an electromagnetic valve at one end of the main valve core is electrified to open a sealing cover controlled by the electromagnetic valve, the main valve core is at a first position;
when the electromagnetic valve at the other end of the main valve core is electrified to open the sealing cover controlled by the electromagnetic valve, the main valve core is at a second position;
when the sealing covers at the two ends of the main valve core are closed, the main valve core is in a middle position.
The valve body is also provided with a secondary overflow valve; the secondary overflow valve is arranged on the side surface of the inner cavity of the working oil A port or the working oil B port of the valve body.
The valve body is also provided with a secondary overflow valve plug; and the secondary overflow valve plug is arranged on the side surface of the inner cavity of the working oil port B or the working oil port A of the valve body.
The hydraulic lock and the piston rod are arranged perpendicular to the main valve core.
The oil inlet joint and the tail joint are assembled with the plurality of work joints.
The oil inlet joint is provided with an oil inlet P port and an oil return port T;
an oil inlet port P is communicated with the first oil duct through a working connection port P;
and an oil return port T of the oil inlet joint is communicated with the fifth oil duct and the eighth oil duct.
A pilot pressure oil drainage port is arranged on the tail connector;
the working connection is provided with pilot oil supply ports Va and Vb and pilot oil drain ports L a and L b;
the pilot oil of the tail coupling enters the interior of the working coupling through a pilot oil supply port Va or a pilot oil supply port Vb to push the main valve core to be at the first position or the second position, and the pilot oil flows out through a pilot oil drain port L b or a pilot oil drain port L a and flows back to the hydraulic oil tank through a pilot pressure oil drain port arranged on the tail coupling.
The invention achieves the following beneficial effects:
according to the electric proportional load sensitive multi-way valve integrated with the hydraulic lock, leakage risk is reduced in the working process of an actuating mechanism, the working reliability of the multi-way valve is improved, and meanwhile the matching requirement of a main valve core and a main valve hole is reduced. The pressure compensation function realizes that each actuating mechanism distributes flow according to needs, realizes the composite action of each actuating action of the land leveler, and the electric proportional load sensitive multi-way valve realizes the automatic control of the land leveler, improves the control precision of a hydraulic system and simplifies the oil circuit of the hydraulic system.
Drawings
FIG. 1 is an electrical proportional load sensitive multi-way valve incorporating a hydraulic lock;
FIG. 2 is a cross-sectional view of an electrically proportional load sensitive multi-way valve with integrated hydraulic lock;
the device comprises a base, a pressure sensor; 21 is a working union valve body, 22 is a hydraulic lock, 23 is a piston rod, 24 is a secondary overflow valve, 25 is a pressure compensation valve core, 26 is a main valve core, 27 is an end cover assembly, 28 is an electromagnetic valve, and 29 is a secondary overflow valve plug.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
As shown in fig. 1, the integrated hydraulic lock electric proportional load sensitive multi-way valve of the invention comprises an oil inlet union 1, a plurality of working unions 2, a tail union 3, a stud 5 and a nut 4, wherein the oil inlet union 1, the plurality of working unions 2 and the tail union 3 are assembled by the stud 5 and the nut 4, and the oil inlet union 1 is provided with an oil inlet P port 6 and an oil return port T port 7; the working connection 2 is respectively provided with a working oil A port 9 and a working oil B port 10; the tail connector 3 is provided with a pilot pressure oil drain port 11.
Referring to fig. 2, which is a cross-sectional view of a working unit of the electric proportional load sensitive multi-way valve integrated with a hydraulic lock according to the present invention, the working unit includes a working unit valve body 21, a hydraulic lock 22, a piston rod 23, a secondary overflow valve 24, a pressure compensation valve core 25, a main valve core 26, a secondary overflow valve plug 29, and an end cap assembly 27 with an electromagnetic valve 28. The working connection valve body 21 is provided with a working oil A port 9 and a working oil B port 10, and the pressure compensation valve core 25 is arranged on the lower side of the main valve core 26. Two hydraulic locks 22 and two piston rods 23 are integrated on the upper side of the main valve element 26 on the upper side of the main valve element 21, and are arranged perpendicular to the main valve element 26. The secondary overflow valve 24 and the secondary overflow valve plug 29 are respectively arranged on two sides of the hydraulic lock 22, and whether the secondary overflow valve 24 is configured or not can be determined according to working condition requirements. The end cover assemblies 27 are fixed on two sides of the working connection valve body 21 through bolts, the electromagnetic valve 28 is obliquely inserted into the end covers, the secondary overflow valve is convenient to disassemble, the working connection structure is compact, and meanwhile the secondary overflow valve has the functions of valve post-compensation, hydraulic locking and electric proportion accurate control, works safely and reliably, and simplifies the pipeline arrangement of a system.
Referring to fig. 2, when the end covers at the two sides of the multi-way valve working link are not electrified, the working link is in a neutral position, oil supplied to the port P6 of the oil inlet link does not enter the working link 2, at the moment, the pressure at the two ports of the hydraulic lock 22 is in a blocking state, and the pressure oil of the oil cylinder is sealed in the pipeline, so that the leakage oil generated in the pipeline is prevented from entering the oil tank, and the safety and reliability of each actuating mechanism of the land leveler in the working process are ensured.
The internal spring of the hydraulic lock 22 is positioned in the one-way valve core in the hydraulic lock, when the multi-way valve working oil port returns oil, the one-way valve core in the hydraulic lock 22 and the internal spring of the lock are pushed by the piston rod 23, so that the oil duct 36 (or the oil duct 37) is communicated with the oil duct 34 (or the oil duct 39), oil return in the actuating mechanism is realized, the rigidity of the spring is adjusted, and the oil return speed of the actuating oil cylinder can be controlled. The smaller the spring stiffness is, the easier the one-way valve core is pushed, and the faster the oil return speed is; the higher the spring stiffness is, the more difficult the one-way valve core is pushed, and the slower the oil return speed is.
The working process is as follows:
the electromagnetic valve on the side of the working connection ｃA is electrified to be opened, pilot oil acts on the right side of the main valve core 26 to push the main valve core 26 to move leftwards to be in ｃA first position, ｃA throttling groove of P-A is opened, oil supplied from an oil inlet P port 6 enters an oil channel 31 through ｃA working connection P port 30, ｃA pressure compensation valve core 25 is opened, the oil enters an oil channel 33 through an oil channel 32, high-pressure oil in the oil channel 33 is guided to push the two piston rods 23 through oil channels PｃA 'and Pb' which are communicated with the oil channel 33 and respectively face the two piston rods 23, two hydraulic locks 22 are opened, meanwhile, the throttling groove of the main valve core 26 communicated with the oil channel 39 is opened, the oil enters the oil channel 39 and enters the oil channel 37 through the hydraulic lock 22 on the left side in the drawing, oil is supplied; meanwhile, oil in the small cavity of the oil cylinder enters the hydraulic lock 22 on the right side in the figure from an oil duct 36 through a working oil port B, enters an oil duct 34, enters a T-shaped oil duct 35 through a throttling groove in the main valve core, which is communicated with the oil duct 35, and enters an oil return port T7 of the oil inlet connector 1.
The electromagnetic valve on the side of the working connection B is electrified and opened, pilot oil acts on the left side of the main valve core 26, the main valve core 26 is pushed to move rightwards to be located at a second position, a throttling groove of P-B is opened, oil supplied from an oil inlet P port 6 enters an oil duct 31 through a working connection P port 30, a pressure compensation valve core 25 is opened and enters an oil duct 33 through an oil duct 32, high-pressure oil in the oil duct 33 enters oil ducts Pa 'and Pb' to push two piston rods 33, two hydraulic locks 22 are opened, meanwhile, the throttling groove of the main valve core 26 communicated with the oil duct 34 is opened, oil enters the oil duct 34 and enters the oil duct 36 through the hydraulic lock 22 on the right side in the drawing, oil supply of a working oil B port 10 is achieved; meanwhile, oil in the large cavity of the oil cylinder enters the hydraulic lock 22 on the left side in the figure from the oil duct 37 through the working oil A port 9, enters the oil duct 39, enters the T oil duct 38 through a throttling groove on the main valve core, which is communicated with the oil duct 38, and enters the oil return port T port 7 of the oil inlet connector 1; if the load is too large in the working process of the execution oil cylinder and the pressure exceeds the set pressure of the secondary overflow valve 24, the overflow valve 24 is opened, and the pressure oil in the inner cavity of the working oil B port can overflow through the secondary overflow valve 24, so that the working safety of the system is ensured.
Referring to fig. 2, the working link 2 is provided with pilot oil supply ports Va and Vb and pilot oil drain ports L a and L b, when the a-side solenoid valve is energized, pilot oil of the tail link enters the pilot oil supply port Va and enters the inside of the a-side end cap through the solenoid valve to push the main valve element to be in the first position, and simultaneously, pilot oil inside the b-side end cap enters the pilot oil drain port L b through the solenoid valve and returns to the hydraulic oil tank through the pilot pressure oil drain port 11 provided on the tail link 3. when the b-side solenoid valve is energized, pilot oil of the tail link enters the pilot oil supply port Vb and enters the inside of the b-side end cap through the solenoid valve to push the main valve element to be in the second position, and simultaneously, pilot oil inside the a-side end cap enters the pilot oil drain port L a through the solenoid valve and returns to the hydraulic oil tank through the pilot pressure oil.
The invention can also be used in the field of electric proportional control multi-way valves of backhoe loaders and the like which need integrated hydraulic locks.
The invention designs an electric proportional load sensitive multi-way valve integrated with a hydraulic lock, which integrates innovative points such as a valve back compensation function, a hydraulic lock function, electric proportional precise control and the like into a multi-way valve working link through designing a compact working link casting structure, a valve body and an electric control end cover on the basis of the original hydraulic pilot controlled load sensitive multi-way valve, reduces the number of external hydraulic locks and increases the system safety through the integrated design of the hydraulic lock, controls the oil return speed of a grader execution oil cylinder through the hydraulic lock, has safe and reliable work and good performance, realizes the composite action and automatic control of each execution action of the grader, improves the operation control precision of the grader, lightens the operation intensity of an operator, simplifies an oil path of a hydraulic system, and saves the product development cost. The multi-way valve structure formed by adopting equivalent replacement or equivalent transformation falls into the protection scope claimed by the invention.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (9)
1. An electric proportional load sensitive multi-way valve integrated with a hydraulic lock is characterized by comprising a working link; the working connection comprises a valve body, a main valve core arranged in the valve body, a pressure compensation valve core positioned on one side of the main valve core, and two hydraulic locks and two piston rods positioned on the other side of the main valve core;
the two hydraulic locks are respectively opened by the pressure of the two piston rods correspondingly; the first piston rod and the second piston rod are respectively arranged on the third oil duct, and the first piston rod and the second piston rod are driven by the liquid pressure in the oil duct to respectively and correspondingly transmit pressure to the first hydraulic lock and the second hydraulic lock;
the valve body is provided with a working oil A port and a working oil B port, the working oil A port is communicated with the ninth oil duct through the opened first hydraulic lock, and the working oil B port is communicated with the fourth oil duct through the opened second hydraulic lock;
the main valve core has three position states of a middle position, a first position and a second position;
wherein,
the pilot oil acts on the right side of the main valve element, and when the main valve element is at the first position, a first oil duct leading to the pressure compensation valve element and a ninth oil duct leading to the left second hydraulic lock are opened; the pressure compensation valve core is opened by the liquid pressure in the first oil duct, and when the pressure compensation valve core is opened, the first oil duct is communicated with the third oil duct; meanwhile, the fourth oil duct is communicated with a fifth oil duct for returning oil;
the pilot oil acts on the left side of the main valve element, and when the main valve element is at the second position, a first oil duct leading to the pressure compensation valve element and a fourth oil duct leading to a first hydraulic lock on the right side are opened; the pressure compensation valve core is opened by the liquid pressure in the first oil duct, and when the pressure compensation valve core is opened, the first oil duct is communicated with the third oil duct; meanwhile, the ninth oil duct is communicated with an eighth oil duct for returning oil;
when the main valve core is in the middle position, the supplied liquid does not enter the working connection, and the two hydraulic locks are blocked;
the hydraulic lock and the piston rod are arranged perpendicular to the main valve core.
2. The electric proportional load sensitive multi-way valve with the integrated hydraulic lock as claimed in claim 1, wherein a plurality of throttling grooves are formed in the main valve core, and the oil passages are opened and communicated correspondingly to the corresponding positions of the throttling grooves.
3. The electric proportional load sensitive multi-way valve with the integrated hydraulic lock as claimed in claim 1, wherein two ends of the main valve core are respectively closed by an end cap controlled by a solenoid valve.
4. The electric proportional load sensitive multi-way valve with the integrated hydraulic lock as claimed in claim 3, wherein when the solenoid valve at one end of the main valve element is energized to open the sealing cover controlled by the solenoid valve, the main valve element is at the first position;
when the electromagnetic valve at the other end of the main valve core is electrified to open the sealing cover controlled by the electromagnetic valve, the main valve core is at a second position;
when the sealing covers at the two ends of the main valve core are closed, the main valve core is in a middle position.
5. The electric proportional load sensitive multi-way valve integrated with the hydraulic lock as claimed in claim 1, wherein a secondary overflow valve is further arranged on the valve body; the secondary overflow valve is arranged on the side surface of the inner cavity of the working oil A port or the working oil B port of the valve body.
6. The electric proportional load sensitive multi-way valve integrated with the hydraulic lock as claimed in claim 5, wherein a secondary overflow valve plug is further arranged on the valve body; and the secondary overflow valve plug is arranged on the side surface of the inner cavity of the working oil port B or the working oil port A of the valve body.
7. The electrically proportional load sensitive multi-way valve with an integrated hydraulic lock as claimed in claim 1, wherein an oil inlet joint and a tail joint are assembled with a plurality of the working joints.
8. The electrically proportional load sensitive multi-way valve with the integrated hydraulic lock as claimed in claim 7, wherein the oil inlet joint is provided with an oil inlet P and an oil return T;
an oil inlet port P is communicated with the first oil duct through a working connection port P;
and an oil return port T of the oil inlet joint is communicated with the fifth oil duct and the eighth oil duct.
9. The electric proportional load sensitive multi-way valve integrated with the hydraulic lock as claimed in claim 7, wherein a pilot pressure oil drain port is arranged on a tail coupler;
the working connection is provided with pilot oil supply ports Va and Vb and pilot oil drain ports L a and L b;
the pilot oil of the tail coupling enters the interior of the working coupling through a pilot oil supply port Va or a pilot oil supply port Vb to push the main valve core to be at the first position or the second position, and the pilot oil flows out through a pilot oil drain port L b or a pilot oil drain port L a and flows back to the hydraulic oil tank through a pilot pressure oil drain port arranged on the tail coupling.
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| CN201910048500.5A CN109707690B (en) | 2019-01-18 | 2019-01-18 | Electric proportional load sensitive multi-way valve integrated with hydraulic lock |
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| CN201910048500.5A CN109707690B (en) | 2019-01-18 | 2019-01-18 | Electric proportional load sensitive multi-way valve integrated with hydraulic lock |
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| CN110848190A (en) * | 2019-09-25 | 2020-02-28 | 张家口凯航液压科技有限公司 | Integrated load sensitive flow divider valve |
| CN111156216A (en) * | 2020-01-21 | 2020-05-15 | 日照海卓液压有限公司 | Multi-way valve with integral mechanical pilot check valve and electro-hydraulic proportional control |
| CN111120443A (en) * | 2020-01-21 | 2020-05-08 | 日照海卓液压有限公司 | Multi-way reversing valve based on integral type thread cartridge pilot hydraulic lock |
| CN111927842B (en) * | 2020-07-16 | 2024-06-21 | 浙江工业大学 | Digital fluid pilot driven programmable control assembled hydraulic multi-way valve |
| CN113357215A (en) * | 2021-06-25 | 2021-09-07 | 江苏谷登重型机械装备科技有限公司 | Hydraulic multi-way valve for static pile press |
| CN113931895B (en) * | 2021-09-29 | 2022-11-11 | 常德中联重科液压有限公司 | Hydraulic valve structure and split type multi-way valve |
| CN115388056B (en) * | 2022-07-11 | 2024-07-26 | 福州大学 | Pressure trigger type pilot-operated switch valve |
| CN118408055A (en) * | 2024-06-27 | 2024-07-30 | 浙江大学 | Position control assembly and explosion-proof reversing unit and multi-way reversing valve using same |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201560992U (en) * | 2009-04-30 | 2010-08-25 | 泸州江阳长江液压科技有限公司 | Pilot-operated hydraulic lock multi-way directional valve set |
| CN202251199U (en) * | 2011-10-20 | 2012-05-30 | 常德中联重科液压有限公司 | Electro-hydraulic proportional combined maneuvering valve |
| CN203067384U (en) * | 2012-12-18 | 2013-07-17 | 徐工集团工程机械股份有限公司江苏徐州工程机械研究院 | Electro-hydraulic proportional flow amplifying valve |
| CN105840574B (en) * | 2015-01-16 | 2018-04-06 | 徐工集团工程机械股份有限公司 | Load sensing multi-way valve and construction machinery hydraulic system |
| CN207212804U (en) * | 2017-08-24 | 2018-04-10 | 丰隆高科液压股份有限公司 | The manual load sensing multi-way valve of type of priority |
| CN108194441B (en) * | 2017-12-28 | 2024-02-02 | 江苏徐工工程机械研究院有限公司 | Multi-way valve tail connection and electro-hydraulic proportional multi-way valve |
| CN108716491B (en) * | 2018-05-28 | 2022-02-11 | 徐州燕大传动与控制技术有限公司 | Three-position five-way load port independent control multi-way valve with O-shaped neutral position function |
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